I was diagnosed with SVT 9 years ago. I have always took toporol for the SVT and it slowed or went away same as the palpitations. Well 1 month my heart went into a episode that would not quit; the doctors said it was pac premature atrial contractions. I decided to go to a better hospital they said the same thing. Finally, I went to another hospital that recommended a cardiac work up. The doctor had me do 30 event monitor, she said there she found that the bottom part of my heart was misfiring and that I need to see an electric doctor; who would do an ablasion on the right side and fix the problem. Now, my palpitations are quite frequent, but the firing problem only lasted about 7 beats 1 time in the 30 days. I take 200 mg of toporol now a day. Is anyone else's palpitations this way? I am so scared sometimes. Is this firing problem dangerous? Is there anything that I need to be persistent about such as meds and things afterwards? I want to repeat, I am so scared.